On the 20th of March, a massive crowd of protesters including many from Occupied Palestine rallied at the White House before marching in force on the Convention Center, where AIPAC was holding their convention and Hillery Clinton was due to speak. Secret Service tried to disrupt the initial rally by "closing" Penn Ave but the crowd refused to move. It was nearly an hour later that everyone finally did leave the disputed area, only to stream through the streets and confront attendees at AIPAC a few blocks away. One marcher recieved minor injuries in a confrontation with a very aggressive AIPAC attendee, but for the most part it was AIPAC that was forced onto the defensive. The protest was several times larger than the past few year's AIPAC protests and much more militant.
Secret Service attempted to push the intial rally into Lafayette Park (Peace park) with their usual whistles and then by telling cooperating bystanders "they're all getting arrested" but the crowd would have required hours, dozens of busses, and probably over 1,000 cops to mass arrest. The resulting court cases would have then cost the government millions in judgements. Alternately, the cops could have tried pepper spray and clubs, but they were not judged a serious threat by a crowd including people who have faced Israeli troops on the field of battle. In the end, with their bluff called, they decided they had no choice but to let the rally continue until the march started about an hour later.
That march went through Chinatown, where it was announced that Hillery Clinton had plans to address the AIPAC delegates at the Verizon Center rather than at the Convention Center, one hour from the announcment. The person making this announcment suggested staying in that area to block AIPAC delegages from moving but was quickly overruled or ignored. The march proceeded to the Convention Center, and well over an hour later there was no evidence of any attempt to move the whole mess past this tough and determined crowd. A motorcade that could have belonged to Hillery Clinton or some other big shot did go to the Convention Center by the 7th st entrance, no evidence of one going south was seen by anyone,
Time and again, the huge crowd erupted in booing when AIPAC delegates ran the gauntlet to get to the Convention Center's doors.